A DEVICE FOR SECURING SUPERIMPOSED REINFORCING RODS

Abstract: The invention relates to a method and a device for connecting superimposed reinforcing rods (W), wherein a bent length of connecting wire (K) is placed from one side down over the superimposed rods and the rods are then tightened together by causing the free ends of the bent wire length to be deformed from the opposite side. The connecting wire length is placed in the form of a preshaped staple of a strong and stiff metal. The staple legs are guided in guiding grooves (4) on the inner side of the legs and the cross piece of a substantially U-shaped form piece (1), that is placed from the opposite side over the superimposed rods and is divided along a midplane perpendicular to the plane of the U, in such a way, that the ends of the staple legs are guided - within the cross piece of the form piece - towards or past each other around the rod that is turned away from the cross piece of the staple.

Description: Short title: A device for securing superimposed reinforcing rods. The invention relates to a device for securing super-Lnposed reinforcing rods by means of a length of wire that has been preformed into a substantially U-shaped staple, ccnprising a form piece with a U-shaped forming surface that is adapted to the staple, and with a casing having a receiving chamber for a staple located adjacent the opening of said U-shaped forming surface, the form piece and the casing being mounted so as to be mutually turned between an open position allowing two superimposed rods to be received in the space between the legs of the U-shaped forming surface and a closed position, in which the received rods are locked around, said casing acxx-oirnc ating a stamp which may be moved, through said receiving cnamber, towards the cross piece of the U-shaped foπning surface of the form piece to press the staple - with its legs directed fαrwardly - from the receiving chamber into the forming space of the form piece around the pair of rods contained therein, guiding grooves being provided on the inner side of the legs and the cross piece of the forming surface to guide the staple legs within the cross piece portion of the form piece towards one another or one past the other respectively. Such a device is disclosed in DE-A-3223090 (vide in particular the embodiment aσcxjrding to fig. 15) . This well-knc-wn device is to be preferred over other erribod-lments. due to the lower one of the two SLTperimposed reinforcing rods being supported during the deformation of the preformed staple within the form piece so that the two rods are adequately pressed together. With this well-known device the form piece is provided in a rather elongated member, which forms - together with the casing that is also provided in a rather elongated element - a pair of pincers, the lower and upper jaws of which are formed by the form piece and the casing respectively. In the opened position the pinσer-like device is applied with its lower jaw extending below the two superimposed reinforcing rods so as to receive these rods into the forming space confined by the U-shaped forming surface. It is a drawback of this well-kncwn device, that its handling may be nindered by adjacent reinforcing rods which belong to the same reinforcing network. Due to the lower jaw (foϋiiing piece) being - in use - positioned completely below the plane of the ijpermost reinforcing rod, the use of the device for securing super-imposed reinforcing rods will be even impossible in case of a reinforcing net having a ,l mesh n which is smaller than the horizontal dimension of the form piece. The invention aims at to overcome the above drawback. Acxx>rdir_g to the invention this aim is achieved in that the form piece is formed as a U-shaped brace, which is divided along the mid plane that is perpendicular to the plane of the brace, one part of the brace being fixedly cαrmected with the casing and the other part of the brace being mounted to be swung outwardly relative to said first part. It will be appreciated, that a device cx_ατst.nιcted in accordance with the invention may be simply applied - with the form piece in the open position - around the two superimposed reinforcing rods, even in case of a "fine-mesh" reinforcing net. It is to be remarked, that EE-A-3524821 discloses a device for securing cross-wise super:lmposed reinforcing rods, in which a form piece is used which consists of two hook-shaped portions. This device may also be used in case of relatively "fine-mesh" reinforcing nets. With this well-known device the two hook-shaped forming portions are placed straddlingly over the upper one of the two crossing reinforcing rods and then hooked from under the lowermost reinforcing rod, after which the free end portions of the preformed staple are bent along the semi-circular inner forming surface of the hook-shape forming portions and around the Icwermost reinforcing rod in planes which are directed rerpendicular to the plane of the staple, Consequently another type of ∞πnection is involved with this well-known device, which cannot be used for securing superimposed reinforcing rods that extend in the same direction. The invention will be hereinafter .aUrther explained by way of example with reference to the drawing. Fig. 1 is a perspective view iiliistxat-ing the principle of the method and of the device according to the invention; fig. 2 is a side view of a practical eπibodiment of the device according to the invention; fig. 3 is a view, as seen from the right in fig. 2; fig. 4 is a view along the line IV-IV in fig. 2 and 3 and fig. 5 is a cross-sectional view along the line V-V in fig. 2. In fig. 1 two cross-wise superύiposed reinforcing rods are designated by dash-dotted lines W. 1 designates a substantially U- shaped form piece, the legs 2 of which extend from below upwardly through two opposite angles between the two cross-wise superimposed reinforcing rods. The legs 2 merge along an arc into the cross piece 3 of the U and have beveled edges 2a. The opposite faces of the legs 2 are provided with guiding grooves 4. These guiding grooves ccntinue in the cross-piece 3 and simultaneously deflect laterally from the plane of the U. Consequently the guiding groove portions 4a in the cross piece 3 extend laterally along one another. The guiding grooves 4, 4a have e.g. a sem -circular cross- section and function to guide the legs KL of a substantially U-shaped staple K. This staple is pushed from above - with its free leg ends directed downwardly - (vide the arrow direction) into the space between the legs 2 of the form piece 1 by means of a stamp member 5 that acts on the cross piece K2 of the staple K. During the final phase of the downward stroke of the stamp member 5 the staple legs KL, while moving through the guiding groove portions 4a - gradually bend inwardly and simultaneously deflect laterally from the plane of the K to spread apart. Finally the so deformed staple K gets pressed with its cross piece K2 upon the upper one of the two superimposed rods W, while the bent end portions of the legs KL of the staple K get pressed around the lcwer one of the two rods on both sides of the crossing point. In the practical embodiment according to fig. 2-5 the U-shaped form piece 1 is divided along a miφlane perpendicular to the plane of the U and consequently consists of two J-shaped halves or jaws 6 and 7. These jaws 6, 7 are pivotally connected about an axis 8 that is positioned within said miφlane at a distannp above the cross piece of the U. The jaws 6, 7 may thus move one relative to the other between a closed position corresponding with the position of the U-shaped, form piece 1 in fig. 1 and an open position, in which the form piece 1 may be placed - with the open jaws - down over two superimposed rein¬ forcing rods W. In the closed position the two jaws interlockingly engage one another by means of a centering hole and a corresponding centering projection 9 and 9a respectively. The jaw 6 is a fixed jaw, in the sense, that this jaw is extended at its upper end and fastened to the lower end wall 11 of a pneumatic actuating cylinder 10, the upper end wall 1 of which is connected to a carrying rod 3 provided with a handle 14. 15 designates a staple supply magazine, ocnprising upper and bottom walls 16, sidewalls 17 and an end wall 18, which is also fixedly connected to the cylinder end wall 11. The end wall 18 carries the pivot axis 8, about which the second jaw 7 is pivotally mounted through a laterally slightly offset arm 19. The pressurized air ccainection for operating the piston 20 has not been shown. The pressurized air supply may be e.g. controlled by means of a control valve provided on or adjacent the handle 14 and equipped with an appropriate actuating button. The piston 20, which may be moved against the action of a pressure spring 21, is pivotally connected at 22 to the stamp member 5, that extends with its lower end through a slot 23 in the lower cylinder end wall 11 into a chamber at the end of the magazine 15. Said chamber, the csross-sectiαnal area of which corresponds with that of the slot 23 in the cylinder end wall 11, is delimited by the end wall 18 and the sidewalls 17 of the magazine and has on the bottom side a passage slot 24 towards the space, between the legs (jaws) of the U-shaped form piece 1, said passage 24 corresponding with the passage slot 23 in the cylinder end wall 10. In the example shown a control means 25 of the Bσwden cable type is provided for opening and closing the jaws 6 and 7. The stationary sheath 26 of this control cable is secured to the rarrying rod 13 and the upper cylinder end wall 12 at 27 and 28 respectively, whereas the cable core 29 is, at 30, connected to a manually operated lever 32 that is pivotally connected at 31 to the handle 14, and, on the other hand, is connected at 33 to the free end of the arm 16, to which the movable jaw 7 is secured, -formally, i.e. when the lever 32 is not squeezed, the pressure spring 34 holds the jaw 7 in the opened position. In this position the device may thus be placed down over a pair of siiperimposed reinforcing rods so as to secure the latter together. The jaws 6, 7 and the U-shaped form piece 1 may then be closed around the reinforcing rods to be secured by squeezing the lever 32. In this stage the piston 20 is in its upper position, with the lower end of the stamp member 5 resting an the cross piece of the foremost staple of the staple supply within the chamber, i.e. ready to perform an operative stroke. While the lever 32 is held squeezed to keep the form piece closed, pressurized air is supplied to move the piston 20 and thereby the stamp member 5 downwardly. This causes the staple K to be pressed, in the above described manner, through the chamber at the end of the magazine into the space between the legs of the U-shaped form piece 1, whereby the staple legs are deformed, in the manner described hereinabove, into a fastener wire that secures the two reinforcing rods. An int-erruption of the pressurized air supply causes the piston 20 and thereby the stamp member 5 to return to the upper or starting position, so that the magazine spring 35 may push a next staple, positioned at the foremost end of the magazine supply, into the chamber. A release of the lever 32 causes the jaws 6, 7 to open, after which the device may be removed from the secured rods and transferred to a next securing location. The example described hereinabσve may be modified in various ways as far as the means for oontrolling the stamp member and the opening and closing of the jaws of the form piece are ∞ncerned.

Claims: CLAIMS 1. A device for securing superimposed reinforcing rods by means of a length of wire that has been preformed into a substantially U-shaped staple, comprising a form piece with a U-shaped forming surface that is adapted to the staple, and with a casing having a receiving C-hamber for a staple located adjacent the opening of said U-s aped forming surface, the form piece and the casing being mounted so as to be mutually turned between an open position allowing two superiπposed rods to be received in the space between the legs of the U-shaped forming surface and a closed position, in which the received rods are locked around, said casing acccsαmK- ating a stamp which may be moved, ■ through said receiving chamber, towards the cross piece of the U- shaped forming surface of the form piece to press the staple - with its legs directed forwardly - from the receiving cihariher into the form space of the form piece around the pair of rods contained therein, guiding grooves being provided on the inner side of the legs and the cross piece of the forming surface to guide the staple legs within the cross piece portion of the form piece -towards one another or one past the other respectively, characterized in that the forming piece is formed as a U-shaped brace, which is divided along the mid plane perpendicular to the plane of the brace, one part of the brace being fixedly connected to the casing and the other part of the brace being mounted to be swung outwardly relative to said first part. 2. A device according to claim 1, wherein the stamp member forms the piston rod of a pressure operated actuating cylinder, charac¬ terized in that the stamp member is adapted to move through a passage slot in the cylinder end wall into the chamber of the casing and from said chamber through a second passage slot into the space between the legs of the form piece. 3. A device accor ing to claims 1-2, characterized in that the movable part (jaw) of the brace-like form piece is pivotally connected - -through a laterally offset arm - about an axis carried by the end wall of the casing. 4. A device according to claims 1-3, characterized in that the two parts or jaws of the brace-like form piece are closable - from the normally open position - by means of a control element of the Bcwden cable type. 5. A device according to claims 1-4, characterized in that the actuating cyl-lnder is connected - with its end wall turned away from the casing and the form piece, to a carrying rod.

Inventors: DE ROO JOHN PETER CORNELIS, DE ROO, JOHN, PETER, CORNELIS
Applicants: GADON B V, ROO JOHN PETER CORNELIS DE, DE ROO, JOHN, PETER, CORNELIS, GADON B.V.
Application year: 1994
Main classification: E04G21
IPC codes: E04C5, E04G21